Decagon Devices AquaLab 4TE Operator's Manual page 118

AquaLab
Appendix A
Table 2: Water Activity of Selected Salt Solutions
Saturated
Solution
Chloride
Magnesium
Chloride
Potassium
Carbonate
Magnesium
Chloride
Potassium
Chloride
Potassium
Adapted from Greenspan (1977). Rounded to nearest thousandth.
4. Saturated salt solutions are very temperature-sensitive and their
values are not as accurate as the verifi cation standards off ered by
Decagon.
a
w
Lithium 0.113 ± 0.003
0.331 ± 0.002
0.432 ± 0.003
0.544 ± 0.002
Nitrate
Sodium 0.755 ± 0.001
0.851 ± 0.003
0.976 ± 0.005
Sulfate
at 20° C
0.113 ± 0.003
0.328 ± 0.002
0.432 ± 0.004
0.529 ± 0.002
0.753 ± 0.001
0.843 ± 0.003
0.973 ± 0.005
112
a at 25° C
w